@folkfreak
Name an audible benefit DSD provides over PCM; or explain an audible defect of PCM. To save time, “smearing” isn’t a valid response. PCM perfectly captures the waveforms below Nyquist and even undithered 16Bit has a larger dynamic range than our rooms allow. 16/44.1 is audibly perfect, assuming your DAC is good enough, it is easily verified by measurements/math as well as human trials; it’s all marketing.
Here’s a preamp with an internal word clock in/out Direct experience makes no difference if it’s under sighted conditions. There is a company that sells anti-vibration stickers, and people believe they work.
And again, OP has never stated what he owns except the Marantz, so maybe an external word clock can’t even be used. Multi-box systems for residential use are extremely rare. I stated pre-amp for if one had a digital input that OP would use for plain CD, meaning if it was better than the DAC in the Marantz, which would be used for SACD. As again, What would this external clock going to be syncing, the Marantz and what?
And I still don’t buy that an external upsampler vs an internal one makes an audible difference,
44.1kHz filter performance by the Benchmark DAC3B, which internally upsamples to >200khz, no audible aliasing or imaging, or are you saying the Vivaldi performs worse than a $2K DAC?
Stereophile measurements show the Marantz is of transparent performance, so there is no need to add any tweaks for analog output.
Spending $4K on an external word clock for residential use is just throwing money down the drain.